裂缝型火山岩油藏成藏规律研究与应用

Research and Application of Reservoir Forming Rules of Fractured Volcanic Reservoir

ND火山岩油藏为裂缝孔隙型油藏,认识成藏规律和裂缝分布对井位部署和有效开发极为重要。通过解剖ND火山岩轴部裂缝发育区所有单井,发现高产井的出油层段均位于断裂破碎面之上,断裂破碎面作为油气运移的通道和储集空间、加之上覆相对塑性地层和相适应的低压系统匹配成的保存条件,轴部区为断裂破碎带成藏。为了提高钻井成功率和有效开发ND火山岩油藏,依据火山岩地层中断裂等同于裂缝的研究成果,借助用于识别断裂系统的相干体属性这一简单技术来识别裂缝发育区。采用等比例划分窗口技术,进而提取相干振幅属性,得出的裂缝发育区与高产井区十分吻合,表明该技术是预测致密火山岩裂缝发育区的一种有效技术手段。通过对失利井的分析,得出具有良好的封存条件是裂缝型火山岩油藏成藏的关键因素之一。并对裂缝不发育区采用水平井大型体积压裂开发动用技术,取得较好效果。

Niudong volcanic reservoirs are reservoirs of fracture porosity. Fracture is both a reservoir space and the most important flow channel. Unclear understanding for the crack distribution and forming rules will result in well deployment failure. In order to increase drilling success rate and develop ND volcanic reservoir effectively, a simple technology of identifying coherent body property of fault system was used to identify fracture development zones by means of equal proportion window-division technology. Small plane coherent layer amplitude attribute or attributes of the laminated small layer were obtained by extraction to predict fracture zone, the results of which is quite consistent with the high-yield wells region, indicating that the technique is an effective method for predicting dense volcanic rock fracture zones and is of guiding significance for the optimization of pattern deployment, potential tapping by sidetracking. Through analysis on drilling failure wells, favorable sealing condition is a key factor for the reservoir forming of fractured volcanic reservoirs. The technology of large volume fracturing horizontal wells was used for underdeveloped crack zone with good results.